Polytetrafluorethylene PTFE is used in flare pyrotechnical compositions, together with a metallic fuel, usually magnesium or aluminum plus a binder. This paper presents new research on the flare pyrotechnical compositions for thermal decoys, obtained from polytetrafluorethylene (PTFE), carburants like aluminum or magnesium, phenol-formaldehyde resine and graphite. DTA differential thermal analysis is used to determine the thermal behaviour of energetic material and the auto-inflammation temperature. For performance characteristic of pyrotechnic compositions, the combustion velocity has been determined.
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This paper emphasizes a groundwater quality assessment using thirty-seven hydro-geological drillings, located in vulnerable and non-vulnerable areas in Botosani County as regarding nitrate and nitrites based pollutants and also phosphates and ammonium, during 2001-2008. The groundwater quality from vulnerable areas is within allowed limits. It was observed a decrease of nitrates and nitrites concentration in four locations designated as vulnerable zones regarding nitrates. In non-vulnerable areas, the groundwater quality deteriorated between 2006-2008, in terms of ammonium, nitrites and nitrates content. In some hydrogeological drillings, like Sadoveni and Stefanesti, the nitrites concentration (1.54 mg/L, 1.37 mg/L respectively) exceeded the legal accepted limit. The ammonium concentration in non-vulnerable areas also exceeded the limit of 0.5 mg/L. By token of the results of this monitoring activity the risk of groundwater pollution with nitrates was reassessed. MMDD Order 1552/743/2008 approved a new list of localities where sources of nitrates exist from agricultural activities; in Botosani County seventy-seven new localities were designated as vulnerable areas regarding nitrates pollutants.
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This study's aim is to be a continuation of the research conducted by Mihoc et al, 2012 to deternine the heavy metal content for the hemp seeds of Five romanian varieties by following the distribution of Fe, Mn, In, Cu and Ni in the two fractions: hulled hemp seeds and shell as opposed to whole hemp seeds. Microelements content in hemp seeds are: Fe (130-164 mg/kg), Mn (89-108 mg/kg), In (42-57 mg/kg), Cu (10-12 mg/kg), Ni (1.6-6.1 mg/kg), Cr (598-877μ/kg) and Mo (265-652μg/kg). The Pb analysis shows a high dispersion of the results with many values under the quantification limit. Therefore the Pb concentration in hemp seeeds belongs to the range of 217-626 fig/kg excepting the Armanca variety. Iron is concentrated in shell, zinc and nickel in hemp heart, while manganese and copper are equally balanced in both the core and the shell.
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